Which periods this site covers. The Income-tax Act, 2025 came into force on 1 April 2026 (section 1(3) of the Act). Everything on this site is worked out under that Act, so it applies to tax year 2026-27 and later, and to TDS and TCS on payments or credits from 1 April 2026. For income of financial year 2025-26 or earlier (a return, advance tax or TDS for those periods, even if it is filed or paid late now) the interest and fee rules of the Income-tax Act, 1961 apply, and they are not calculated here: the Act keeps them alive in section 536(2), and the CBDT's FAQs on the transition say that income earned in FY 2025-26 is governed by the 1961 Act (Q1.12), that the return for FY 2025-26 is filed under it (Q3.5) and that TDS follows the date of the earlier of credit or payment, the 1961 Act up to 31 March 2026 and the 2025 Act from 1 April 2026 (Q6.1). Read from the Act and the FAQs on 13 November 2026; check the Income Tax Department for any later change.

Late fee and interest calculators, Income-tax Act 2025

Find the interest or fee for a late income tax return, short advance tax, late TDS and late TDS statements. Every rate is taken from the Income-tax Act, 2025 as published in the Gazette, read on 13 November 2026.

The rates at a glance

What went late	Charge	Act
Return filed after the due date	1% a month on unpaid tax	s.423
Advance tax not paid or under 90%	1% a month or part from 1 April	s.424
Advance tax instalment short	3% (Jun, Sep, Dec), 1% (Mar)	s.425
Return fee	up to ₹1,000 or ₹5,000	s.428
TDS not deducted on time	1% a month or part	s.398(3)(a)
TDS deducted, not paid on time	1.5% a month or part	s.398(3)(a)
TDS statement late	₹200 a day (max the tax)	s.427

Good to know

The Income-tax Act, 2025 applies from 1 April 2026 and uses the term "tax year". These interest and fee rules are read from the enacted text, not from a summary. How a part of a month is counted is not defined in the sections, so we count every started month and say so on each page. GST late fees and interest are not covered here.

Common questions

Which interest and fees does the Income-tax Act, 2025 charge for being late?

Interest on unpaid tax for a late return (s.423), interest for not paying advance tax (s.424), interest for short instalments (s.425), interest on late TDS and TCS (s.398), a fee for a late return (s.428) and a fee for a late TDS statement (s.427).

Sources

The Income-tax Act, 2025 (Act No. 30 of 2025), as published in the Gazette of India, Extraordinary (egazette.gov.in), read from the PDF on 13 November 2026. Sections used: 263(1)(c) (due dates), 398(3)(a) (late TDS and TCS interest), 423 (late return interest), 424 (advance tax default), 425 (advance tax deferment), 426 (excess refund), 427 (late statement fee), 428 (late return fee).
Commencement and the repeal of the 1961 Act: section 1(3) (in force on 1 April 2026) and section 536 of the same Act, and the CBDT's "FAQs on Interplay and Transition to the Income-tax Act, 2025" (incometaxindia.gov.in), questions 1.12, 3.5 and 6.1, read on 13 November 2026.
Counting months: sections 398(3)(a) and 424 say "every month or part of a month", and the CBDT's FAQs (Q on interest for defaults in deducting or depositing TDS and for advance tax, read 13 November 2026) say "per month or part thereof". The Act itself leaves "the rounding off of periods when a fraction of a month is involved" to the rules it empowers the Government to make (the list of rule-making powers, clause (u)); those Income-tax Rules were not read. This site therefore counts every started month, measured from the starting date (28 June to 2 July is one month; 10 January to 12 February is two), which matches "month or part thereof" but the rules may fix the starting-date convention differently. Section 423 itself says only "number of months comprised in the period", so its calculator also shows the whole-month count.

Rates and fees read on 13 November 2026 from the Income-tax Act, 2025 as published in the Gazette. Rules can be amended, and the portal or your assessing officer computes the final amount. This site does the arithmetic and is not tax advice; it is not connected with the Income Tax Department.